The 15 Song Album collection:

Would any maths people like to explain why Pi cannot be expressed as a fraction?

We used to use 22/7 for pi in pre-calculator days. It's actually slightly greater than pi, but close enough for most applications. Other fractions used to approximate pi are: 223/71, 333/106, 355/113, and 62832/20000. All can be used to approximate pi depending on the level of precision one requires.
 
Please cool your jets, no one is running out of ideas yet. A good portion of the members on this forum are in Europe and have to work tomorrow. It's late over there and not everyone is retired and a night owl...like me.

01 - Halfway - Salyu
02 - Pi - Kate Bush
03 - No Quarter - Led Zeppelin
04 - 2 out of 3 ain't bad - Meat Loaf
05 - Half The Lies You Tell Aint True - Stereophonics
 
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01 - Halfway - Salyu
02 - Pi - Kate Bush
03 - No Quarter - Led Zeppelin
04 - 2 out of 3 ain't bad - Meat Loaf
05 - Half The Lies You Tell Aint True - Stereophonics
06 - One Third - The Majority
07 - (If Paradise is) Half As Nice - Amen Corner
08 - Seventh Day - Mark Lanegan Band
09 - Two Divided By Love - The Grass Roots YouTube
 
01 - Halfway - Salyu
02 - Pi - Kate Bush
03 - No Quarter - Led Zeppelin
04 - 2 out of 3 ain't bad - Meat Loaf
05 - Half The Lies You Tell Aint True - Stereophonics
06 - One Third - The Majority
07 - (If Paradise is) Half As Nice - Amen Corner
08 - Seventh Day - Mark Lanegan Band
09 - Two Divided By Love - The Grass Roots
10 - Half a Minute - Matt Bianco